Minimal deviation from quick-start example fails

[aparamon]

Long story short

Minimal client example @https://aiohttp.readthedocs.io/en/stable/#getting-started works fine for me. However a minimal deviation printing only status code fails.

Steps to reproduce

import aiohttp
import asyncio

async def fetch(session, url):
    async with session.get(url) as response:
        return response.status

async def main():
    async with aiohttp.ClientSession() as session:
        status = await fetch(session, 'http://python.org')
        print(status)

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

200
SSL error in data received
protocol: <asyncio.sslproto.SSLProtocol object at 0x7f104a8ea6d8>
transport: <_SelectorSocketTransport fd=8 read=polling write=<idle, bufsize=0>>
Traceback (most recent call last):
  File "/usr/lib/python3.7/asyncio/sslproto.py", line 526, in data_received
    ssldata, appdata = self._sslpipe.feed_ssldata(data)
  File "/usr/lib/python3.7/asyncio/sslproto.py", line 207, in feed_ssldata
    self._sslobj.unwrap()
  File "/usr/lib/python3.7/ssl.py", line 767, in unwrap
    return self._sslobj.shutdown()
ssl.SSLError: [SSL: KRB5_S_INIT] application data after close notify (_ssl.c:2605)

Your environment

Reproducible both on Debian GNU/Linux and Windows, Python 3.7, aiohttp 3.5.4.

[aio-libs-bot]

GitMate.io thinks the contributor most likely able to help you is @asvetlov.

Possibly related issues are #2717 ([docs] unittest example fails), #7 (Websocket example fails on Windows), #2148 (Failed tests), #2280 (Test fails on ppc64le), and #2920 (AIOHttp failing after some requests).

[samuelcolvin]

Works fine for me, this is nothing to do with adding the print().

Looking at the traceback it appears to be something to do with SSL. Perhaps you have some kind of proxy in place or an issue with your certificates?

[samuelcolvin]

This seems to be a duplicate of #3535

[aparamon]

@samuelcolvin I doubt the problem is in my set-up: the original minimal example using await response.text() works fine for me.
What additional info might be helpful to debug?

[aparamon]

Ah indeed, mine is a duplicate.
Thanks for pointing it!